根号32=根号（4²*2）=4根号2根号8=根号（2²*2）=2根号22根号1/2=2*（根号2）/2=根号2原式=4根号2-2根号2+根号2=3根号22x²-4x-1=02（x²-2x-1/2)=02（x²-2x+1）=3（x-1)²=3/2x-1=±（根...